I have a basic question about the S7

[Xiang]

I used the s7 in to connect the PLC and read the data in it.But I have a trouble.

The address of one of the data is DB407,D78.1 in PLC.I don't know how to convert it to an address in s7 in so that I can read this data.

[Xiang]

I checked the official document, which does not say how to convert D78.1.

[KarolisL]

Try DB407,X78.1..

booleans are only variables that contain"." in their addressing (unless you use strings) then

DB407,S78.1

[Xiang]

But it is a binary variables not boolean.

[KarolisL]

What do you mean by binary? Binary is representation of number:
10 -decimal
2#1010 - binary
16#A - hex

show screenshot of your DB407, area 78. If your variables are numbers - go for numbers, if they are boolean (true/false) try DB407,X78.1

[Xiang]

I use word directly.DB407,WORD78.1 can get the number what I want.Thank you very much.